Author
National Geographic Society
9
Workman Publishing
8
Olson, Elsie
6
hoopla digital
5
Findaway World, LLC
4
VanCleave, Janice Pratt
4
Borgert-Spaniol, Megan
3
Farndon, John
3
Felix, Rebecca
3
Illinois State Geological Survey
3
Kanopy
3
Mills, Andrea
3
National Geographic
3
Osborne, Mary Pope
3
Tyson, Neil deGrasse
3
Alkire, Jessie
2
BBC Earth
2
Bonnett, Alastair
2
British Broadcasting Corporation
2
Casey, Susan
2
Columbia University Press
2
Cunha, Stephen F.
2
Enz, Tammy
2
Fuller, Gary
2
Garbe, Suzanne
2
Gardner, Jane P.
2
George Philip & Son
2
Gutman, Dan
2
Hansen, Grace
2
Jahren, Hope
2
Jenkins, Steve
2
Kalman, Bobbie
2
Knoll, Andrew H.
2
Leavitt, Amie Jane
2
Lynch, Dan R.
2
McAneney, Caitie
2
McAnulty, Stacy
2
Prothero, Donald R.
2
Regan, Lisa
2
Reilly, Kathleen M.
2
Richards, Jon
2
Romaine, Garret
2
Salas, Laura Purdie
2
Tucci, Paul A.
2
Wiggers, Ray
2
Willman, H. B.
2
Woodward, John
2
Young, Greg
2
Alvarez, Walter
1
Amazing Randi
1
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